http://www.guru3d.com/article/geforce-gtx-580-3-way-sli-review/6
Balls lol, 3-Way 580 GTX SLI manages 140 FPS in Bad Company 2, with DX11, 1920 x 1200, 8x AA, 16x AF, and all settings maxed. @ 2560 with the same settings, you still get 116FPS.
Insane over-kill for sure, but I guess it shows even three-way SLi can actually help.
Crysis seems to be CPU limited as the third 580 actually makes it run worse...crappy games that are not coded well.
In Metro 2033, one 580 is as powerful as 5970(two 5870's), and amazingly enough, performance jumps 100% each card added.
1920 x 1200, AA off, DX11 mode, and settings maxed.
91 FPS. ******* amazing, I thought it was the new Crysis in terms of performance, but wow. Of course, 3x 580 is like...1600-1700$ just by itself, but for those rich ass enthusiasts, be a treat, I'm sure.